Rattlegram vs SharkRF Link
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rattlegram
This app utilizes advanced COFDM technology for audio-based SMS transmission. It supports various modes with specific encoding and modulation techniques, requiring minimal bandwidth for efficient data transfer.
- COFDM technology
- Audio-based SMS
- 160 ms OFDM symbols
- Differential PSK modulation
- Forward error correction
- Low bandwidth requirement
Read full descriptionHide full description
COFDMTV is based on COFDM (coded orthogonal frequency-division multiplexing) technology: - 160 ms long OFDM symbols - 6.25 Hz per sub-carrier - 1/8 guard interval - differentially encoded PSK (phase-shift keying) modulation - systematic polar codes for forward error correction Currently Modes 14, 15 and 16 are supported: Using either SPC(2048, 1392), SPC(2048, 1056) or SPC(2048, 712) with CRC32C aided SCL decoding and differential QPSK modulation for the payload. Only a bandwidth of 1600 Hz is needed and the transmission of either 85, 128 or 170 bytes take about one second with the leading noise and fancy header disabled.
SharkRF Link
Access the management web interface for your SharkRF devices using their unique identifiers. This application also functions as a transceiver for compatible devices.
- Open device web interface
- Use device UIDs
- Transceiver functionality
- Beta version access
Read full descriptionHide full description
The SharkRF Link app lets you open the management web interface of your SharkRF devices based on their UIDs. You can also use the app as a transceiver in case the connected device supports this. Note: beta version, provided “AS IS” without any warranty of any kind.
Screenshots
Verdict
The clearest difference is review sentiment: Rattlegram at 90% against SharkRF Link's 19%. Rattlegram also leads on rating (4.5 vs 2.4). SharkRF Link's advantage is update cadence (every 3 weeks vs every 9 months) and iOS requirement (9.0 vs 17.6). On price, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Rattlegram holds the better App Store score, 4.5 against 2.4. Both are backed by a comparable volume of ratings — 23 and 30 respectively. Written reviews point the same way: 90% of Rattlegram's written reviews are positive against 19% of SharkRF Link's.
Rattlegram ships an update every 9 months, SharkRF Link every 3 weeks. The most recent releases landed on October 11, 2026 and October 21, 2026 respectively.
| Parameter | Rattlegram | SharkRF Link |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (23 ratings) — better | 2.4 (30 ratings) |
| Positive reviews | 90.0% of reviews — better | 19.0% of reviews |
| Number of ratings | 23 | 30 — better |
| Update frequency | Every 9 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | aicodix GmbH | SharkRF OU |
Customer experience
Rattlegram
SharkRF Link
In-app purchases
Rattlegram
No in-app purchases
SharkRF Link
No in-app purchases
